Hydraulic circulator



y 1942- P. BERMAN- 2,283,907

HYDRAULIC C IRCULATOR Filed April 25, 1941 @1 k I w m l PHILIP BERMAN '10 INVENTOR.

ATTORNEY.

Patented May 26, 1942 UNITED STATES TENT OFFICE 1 Claim.

This invention relates to improvements in water circulating devices, and particularly to a circulator which will efficiently utilize the energy of the incoming stream of water under pressure, to cause a rapid circulation of water within the piping of hot water heating installations.

Circulators have heretofore been provided with a water supply nozzle which projected into a mixing chamber having anirregular contour causing sudden changes in stream flow. This arrangement of the device interfered with free flow and produced turbulence and otherwise impaired the efficient operation of the device.

An object of this invention is to provide an improved ci-rculator which avoids the objectionable construction features of the prior art and which comprises a storage chamber which is stream-lined in the direction of flow, and without angles or indentations which cause turbulence and which permits flow therethrough with the least possible resistance.

Another object of this invention is to provide a storage chamber of annular form at least along the entire length of the nozzle, and to make the difference in area of the annular space and the nozzle at the point of inlet to the nozzle greater than the area of the recirculation inlet.

With the above and other objects in view, the

invention will be herein-after more particularly described, and the combination and arrangement of parts will be shown in the accompanying drawing and pointed out in the claim which forms part of this specification.

Reference will now be had to the drawing,

wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a vertical cross-sectional view of the water circulator embodying the invention.

Figure 2 is a cross-sectional view, taken as on line 2-2 in Figure 1.

The water circulator Ill comprises a tubular central portion or body II. A nozzle I2 has been positioned axially of the said tubular body II.

A Venturi or compound tube 13 has been threadably secured at the outlet end of the tubular body I! and in axial alinement therewith. The Venturi tube has a converging lower portion M, a diverging upper portion I5, a throat The nozzle I2 is of conical form so as to increase r the velocity of water passing therethrough. As shown in Figure 1, it will be seen that the outlet edge of the nozzle is substantially of knifeedge thickness which permits merging of the drive and driven streams of water without turbulence.

In operation the water passes through the nozzle l2 and causes the liquid discharged therethrough to be under increased high velocity. The nozzle l2 projects directly into the entrained stream so that the direction of the entrained stream is not changed. The entrained liquid is given an impulse by the circulator jet in the same direction exactly in which it is flowing.

The liquid circul'ator imparts an impulse effect to the liquid and functions to increase the velocity of the liquid and to create a high suction at the throat of the Venturi tube l3, which suction can entrain and accelerate the circulation. V

The outflow from the circulator is in submerged relation centrally of the circulation line, and with the outlined construction of the circul'ator, the energy in the pressure water supply is fully converted into suction in the circulator.

The circulator H] has been designed to efficiently utilize the energy of the incoming stream of water which is supplied under pressure to cause a rapid circulation of water within the p ping.

Circulators have heretofore been provided with a water supply nozzle which projected into a mixing chamber having an irregular contour. This arrangement of the operating mechanism interfered with the flow and produced turbulence and otherwise interfered with the efficient operation of the device.

This improved circulator avoids the objectionable construction features'of the prior art and comprises a mixing chamber which is streamlined in the direction of flow, so that sharp angles or indentations which would cause turbulence are avoided and which permits flow therethrough with the least possible resistance.

The tubular portion l1 forms a metering or mixing chamber in which the driven water meets the drive water from the nozzle. The chamber I! has an upper metering plane l8 and a lower metering plane I9. I prefer to make the metering junction of these streams take place adjacent the lower metering plane l9. I have found that for maximum efliciency the meeting junction of the driveand driven streams should be positioned at a minimum distance above the lower metering plane of the metering part of the neck, or mixing chamber. The lower metering plane is positioned above the outlet from the nozzle a distance substantially equal to the outlet diameter of the nozzle.

The body I l of the water circulator II) has a recirculation inlet 20 in axial alinement with the nozzle 12. The body II has a curved elbowshaped inlet 2! for drive water.

As shown in the drawings, the body ll provides a very large storage chamber 22 for recirculating water. The difference in area of the body and the nozzle at the point of inlet to the nozzle being greater than the area of the recirculation inlet, thereby bringing the full discharge head in substantially undiminished degree to the meeting junction, that is, at the point where the conversion of power takes place.

The body portion preceding the nozzle is so curved for easy fiow as to overcome nearly all of the loss of elbow friction, by maintaining an expansion in that body until it reaches the nozzle.

In accordance with the patent statutes I have described and illustrated the preferred embodiment of my invention, but it Will be understood that various changes and modifications can be made therein without departing from the spirit of the invention as defined by the appended claim.

I claim:

In a stream-lined water circulator, an elongated hollow body for driven water, said hollow body having a curved elbow-shaped inlet terminating in a conical nozzle for drive water under pressure, said hollow body being in circumscribing relation with said nozzle and providing a storage chamber, said body having diminished circular cross-sections from said inlet to the discharge end of said nozzle, the inner contour of said body coextensive with said inlet and nozzle being defined by a radius of curvature equal to the maximum inner diameter of said body, said body comprising a cylindrical metering or mixing chamber for said drive and driven water, said mixing chamber having upper and lower metering planes, said lower metering plane being considerably spaced from the outlet from said nozzle a distance substantially equal to the outlet diameter of said nozzle, the inner Wall of said body being linearly shaped at its upper end to provide a guide wall substantially parallel with and extending beyond said nozzle for continuously guiding said driven water beyond said nozzle and directly into said mixing chamber, the meeting junction of the drive and driven streams of water being positioned adjacent to said lower metering plane, said mixing chamber communicating with a, diverging funnel at the upper end of said body, said hollow body having a recirculation inlet in axial alinement with said nozzle, said storage chamber being of annular form at least along the entire length of said nozzle, the outlet edge of said nozzle being of substantially knife-edge thickness to permit merging of said drive and driven streams of water without turbulence, the difierence in area of said body and said nozzle at the point of inlet to said nozzle being greater than the area of said recirculation inlet, thereby bringing the full discharge head in substantially undiminished degree to said meeting junction.

PHILIP BERMAN. 

